davidhcefx / nano-syntax-highlighting_batch-file Goto Github PK

I discovered a bug that, when there are multiple percentages, the highlighting of variable names would be problematic:

• %var%3
  • expected: %var% 3 (only %var% be highlighted)
  • actual: %var%3
• %%i do echo %b%
  • expected: %%i do echo %b%
  • actual: %%i do echo % b%

The reason is that the %<name>% rule in line 21 doesn't care about word-boundaries. Therefore, it would highlight %var%3 despite that %3 had already been highlighted by another rule. It's the same for the second test case.

As for the solution, the ideal solution is by using lookahead or lookafter regex syntax to rule out special cases for %<name>% rule. However, Posix Extended Regex doesn't support this feature. So, I have set a limit that no spaces can be within variable names to avoid this problem.